Fusion Kit 600/700 to RA770 w/Silicone Cover Retrofit. The dust cover is shaped to perfectly fit your Apollo RA770 when installed using this retrofit kit accommodating the larger screw covers. Specifications for Fusion Retrofit Kit 600/700 to RA770 w/Silicone Cover: Manufacturer: Fusion Color: Black Package Contents: Fusion Retrofit Kit 600/700 to RA770 w/Silicone Cover Fusion 010-12829-00: Kit 600/700 to RA770 w/Silicone Cover Retrofit